Planarian.
plə'nærɪr
中文n. 真涡虫；[无脊椎] 涡虫（等于Turbellaria）
词根词源
Planaria (n.)flat worm-like animal, 1819, from Modern Latin (1776) noun use of fem. of Latin planarius, literally "on level ground" (here used to mean "flat"), from planum, planus "flat, level, even, plain" (see plane (n.1)). Related: Planarian.
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